$24 ELM let me know the coolant temp moves a good bit in the first mile so was well worth it. Needle does not move until pulling into work...

Already have a USB OBDII scanner I paid ~$400 for in 2004... not rushing to spend real money on one again unless absolutely necessary. I think every semi-enthusiast should buy the $23 one and order the BavTech or play with the hacky options if something looks really broken.. or they are really curious too

Also until proved otherwise I am still sure the $23 one pulls all codes. We won't know what some mean like the errors I had a few weeks ago but I'd wager it pulls them

I saw the depth and breadth o'info BT delivers. Of course, their web site's needed to retrieve all. Amazing what can be seen & modified, many makes & models. Like the up-to-date info base.